Metal heat radiator



May 16, .1933. G. RoSENQvlsT METAL HEAT RADIATOR- Filed May 1. 195o 2 Sheets-Sheet l May 16, 1933. I G RosENQvlsT 1,909,552

METAL HEAT RADIATOR Filed May l, 1930 2 Sheets-Sheet 2 M ./3 T l w INVENTOR Zwam@ @0W i Patented May 16,' l1933 uNlTlezDv STATES GUNNAR RosENQvIsT, oF PITTSBURGH, PENNSYLVANIA" METAL HEAT RADIATOR l Application mea xay 1,

'15 its cubical dimensions.

A further object of the invention is the provision of al heat radiator embodying' a composite structure consisting of-a series of sheet metal tubes having integrally formed galvanoplastic metal portions constituting heat radiating fins.

These and other objects of the invention will become more apparent from. a consider-l ation ofthe accompanying drawings in which like reference characters designate' like parts and in .which Fig. l is -an end view o'f a pair of sheet metal plates assembled and prepared in accordance with the principlesof this invention; Fig. 2 a side elevational view thereof; Fig. 3 atop plan view partially .in. section, of acompleted radiator structure taken along the lineIII-III of Fig. 4; Fig. 4 a side elevational view of the structureshown in Fig. 3;

Fig. 5 a horizontal sectional view of the ra- ,diator structure shown in Fig. 3, showing theyfins partly opened; Fig. 6 an end view of a prepared plate of sheet material for4 making a radiator, which is amodiication 4 of that Shown in Fig. 1; Fig. 7 a Similar View of the finished radiator section; Fig. 8

a side elevational View of a pair of plates of sheet material for making radiators for automobiles; Fig. 9 'an e-nd view ofthe exanded radiator, tube' and iin structures; and Fig. Y10 an end view 'of Fig. 8.

Referring to Figs. 1 to 5 inclusive of the y drawings, the structure thereinv illustrated 1 comprises a pairv of sheet metal plates 1 and 2 of copper having a layer Iof adhesive 1930. Serial N0. 448,887.

material such as resinous varnish 3 therebetween, the -metal being of thin gauge and the varnishl functioning to hold them together during the process of fabrication.

A bead or stripe 4 of a syrupysubstance 4 55 which is soluble in water, such for example as dissolved sugar, is laid in stripes as at 4 and alon the edges 5 and 6 on both sides of the joined sheets. After applying these stripes the joined plates are dipped in a preparation of wax and gasoline and are dusted off with graphite flakes or other conducting material thereby coating both sides ofthe doubled sheet. j

l As shown in Figs. 2 and 4, the plates 1 65 and 2 lare provided with a plurality of i perforations or slots 7 in longitudinal alinement forming a row in spaced relation, the Iperforations being made either before or after the sheets are coated with the con- Yducting material. If the perforations are made .after the sheets are coated, the stripe 4 of thesoluble material may be dispensed withv since the shearing edge of the perforating die produces a clean metal surface around the entire ed e of each slot.

Stripes 8 of a suita le insulating material, such as an insulating varnish, are formed between the rows of perforations 7 ,land extendin` the overall outsidey length of the row. Ltripes 9 are then formed between the topand bottom stripes 6 and the ends vof the stripes 8, running the entire length of the sheets between the end stripes 5. Insulating stripes 10 are also applied between 85 the slots conforming to 'their width and all the stripes- 8, 9 and 10 are formed on both vsides of the joined sheets..

The prepared plates are then submerged in water or other solvent to dissolve the sugary substance, which when dissolved exposes additional clean surfaces of copper in lines or stripes corresponding to stripes 5 and 6.

The sheets or plates are next suspended u in an electrolytic solution and a copper deposit of suitable thickness is made on the graphite coated portion and the exposed copper in'a well known manner. The stripes 8,

9 and 10 being of an insulating material, 100,

break the continuity of the copper deposit on the surfaces of sheets 1 and 2 and by turning up the edges of the deposited material at the insulated portion 7, a structure as shown in Figures 3, 4 and 5 is formed.

The deposited copper constitutes heat radiating tins 11 which are integrally joined at and across the edges of perforations or slots 7, as at 12. The intervening portions of sheets 1 and 2 are then separated or expanded to form the tubes 13, communicating passages 14, and the tubes communicating with to and bottom chambers 15. lhe ns 11 may Ibe opened to any angle such as shown in Figs. 3 and 5 and the tubes may be connected in the customary manner to a steam or hot water heating system. lt is evident that the large ins 11 integrally joined with the tubes 13 provide a very large heat radiating surface for the relative overall dimensions of the structure.

lln Figs. 6 and 7 is shown a modiied form of the radiator illustrated in Figs. 1 to 5 inclusive. A single sheet metal plate is coated with the soluble stripes `4. The sheet is .then dipped, as in the double sheet structures, in the wax preparation and dusted on with graphite flakes, thereby coating both sides, as explained above. `Stripes 8 of insulating material are formed on one side of the sheet between the stripes 4 and the prepared sheet is then submerged in Water to dissolve the-stripes 4, leaving correspond- Iing stripes of clean copper surfaces. rllhe sheet is next subjected to the galvanoplastic process described herein with reference to Figs. 1 to 5 inclusive, to form the fins 11 on one side and one wall of the tubes 13. The fins 11 may be opened to any angle such as shown in Fig. 7, and the tubes are joined at the top and bottom and provided with'the customary connections for the heating system.

lln Figs. 8 to 10 of the drawings, have shown a radiator suitable for the cooling of engines of automobiles.' 'l employ substantially the same process but apply it dif- ,ferently to produce a structure sui-table for the purpose. The two sheets 1 and 2 joined by a resinous substance 3 are employed as in the other type of radiator. The sheets are not perforated but the stripes 4 of the sugary substance are applied wherever it is desired to form a deposit integrally with the sheets 1 and 2. In Figs. 8 and 10, such deposits are shown in spaced relation and terminate short of the edges 16 and 17. The edges are likewise coated with this substance forming, beads 18 and are then submerged in dissolved wax and `coated with graphite flakes or other suitable conducting material. Stripes 8 of an insulating material are formed between lthe ends of stripes 4 and along the stripes 18, and the prepared sheets are then submerged in water to dissolve the stripes 4 and 18 which leaves the striped portions clean.

By submerging the sheets in an electrolytic solution and constituting them a vcathode through proper electrical connections, a deposit of copper of 'a suitable thickness is made whichycovers the entire 'surface area of both other faces of the joined sheets, except over the beads 8, though including edges 16 and 17.

There are no deposits over the insulating beads 8. The edges 16 and 17 are joined together and the deposited material is joined integrally with the sheets 1- and 2 at the exposed stripes 4 and 18.

By expanding the sheet-like deposited substance in the manner shown in Fig. 9, a radiator core structure is formed comprising the tube 19 and the internal tins 20. The tube 19 is formed by separating the sheets 1 and 2 between edges 16 and 17 by the application of hydraulic pressure.

llt will be evident from the foregoing that the electrolytically deposited fins 20 are integrally joined with the tube 19 thus providing a most ecient and effective heat conducting joint for dissipating the heat of the tube. The radiator core structure lmay be built up of the units shown in Fig. 9 or such units may be integrally formed by arranging any number of sheets in spaced relation andvjoining them by the galvanoplastic metal.

llt is evident from the foregoing description of this invention that radiators made in accordance therewith provide a maximum heat radiating surface'with a minimum use of material and space, and that such radiators are of inexpensive construction.-

Although several embodiments of the invention have been herein illustrated and described, it will be evident to those skilled in the art that various modifications may be made in the details of construction without departing from the principles herein set forth.

I claim:

1. rlhe method of making composite structures by galvanoplastic process which comp rises depositing a soluble material on portions of metallic sheet members to establish areas of integral contact with the metal to j be deposited thereon, coating said sheet members with a conducting material for be deposited thereon, coating said sheet members with a conducting material for receiving a non-adhering metal deposit thereon, depositing insulating material on said sheet members to establlsh non-conducting areas, dissolving the soluble material therebyexposing clean surface portions, and depositing galvanoplastic metal on the treated surface of the sheet members integrally with said exposed surface portions.

' 3. The method of making radiators which comprises placing a plurality of metal sheets in superposed relation, temporarily joining said sheets with a resinous substance, applying a soluble substance externally of sald sheets to form a plurality of narrow stripes on both sides and the edges of said metal sheets, coating said metal sheets on'both sides with an electrical conducting material',

dissolving the said soluble material", submerging the treated metal sheets in an elec-- trolytic solution to form a deposit of a1- 4vanoplastic material thereon, and su se quently bending the said metal sheets and expanding the deposited metal thereon.

4. The method of making radiators which comprises applying a plurality of narrow stripes of a soluble substance on both sides of a metal sheet, coating said metal sheet with an electrical conducting material, applying stripes of insulating material between some of the soluble stripes to form unjoined portions, vdissolving the said soluble material, submerging vthe treated metal sheet in an electrolytic solution to form a deposit of galvanoplastic metal thereon, and subsequently expanding the deposited metal.

5. The method of making radiators by galvanoplastic process which comprises placing a plurality of metallic sheet members in superposed relation, temporarily joining said sheet members with a resinous substance therebetween and depositing a soluble substance on portions thereof to establish areas-of integral contact with the metallic deposit thereon, coating said members with a conducting substance for receiving metallic deposits, dissolving said soluble substance thereby exposing clean J surface portions, depositing non-conducting substances to establish unjoined portions and subjecting said sheet members to said` galvanoplastic process to form metallic deposits. on the treated surfaces integrally with said exposed portions, subsequently shaping and expanding said sheet members and metallic deposits.

In testimony whereof I have hereunto set my hand this 30 day of A ril, 1930.

so GUNNAR osENQvIsT. 

